linux-kernel - Re: [PATCH] arm64: Do not include __READ

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Date:   Wed, 9 Mar 2022 22:31:59 +0000
From:   Catalin Marinas <catalin.marinas@....com>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Nathan Chancellor <nathan@...nel.org>,
        Will Deacon <will@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev, stable@...r.kernel.org,
        Marc Zyngier <maz@...nel.org>,
        James Morse <james.morse@....com>
Subject: Re: [PATCH] arm64: Do not include __READ_ONCE() block in assembly
 files

On Wed, Mar 09, 2022 at 01:53:50PM -0800, Nick Desaulniers wrote:
> On Wed, Mar 9, 2022 at 11:19 AM Nathan Chancellor <nathan@...nel.org> wrote:
> > Avoid this problem by just avoiding the CONFIG_LTO=y __READ_ONCE() block
> > in asm/rwonce.h with assembly files, as nothing in that block is useful
> > to assembly files, which allows ARM_SMCCC_ARCH_WORKAROUND_3 to be
> > properly expanded with CONFIG_LTO=y builds.
> >
> > Cc: stable@...r.kernel.org
> > Fixes: e35123d83ee3 ("arm64: lto: Strengthen READ_ONCE() to acquire when CONFIG_LTO=y")
> > Link: https://lore.kernel.org/r/20220309155716.3988480-1-maz@kernel.org/
> > Reported-by: Marc Zyngier <maz@...nel.org>
> > Acked-by: James Morse <james.morse@....com>
> > Signed-off-by: Nathan Chancellor <nathan@...nel.org>
> 
> Thanks for taking point on all of the BHB fallout.
> 
> Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>
> Tested-by: Nick Desaulniers <ndesaulniers@...gle.com>

Thanks for the review and testing. Unfortunately I've just sent the pull
request to Linus, so didn't include your tags.

-- 
Catalin